Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "jjb: xci: bifrost-cleanup-jobs: Disable cleanup bifrost jobs"
  - jjb: xci: bifrost-cleanup-jobs: Disable cleanup bifrost jobs

    We no longer update logs in artifacts.opnfv.org so there is no point
    in running this job. We will enable it back when we start uploading logs
    for XCI.

    Change-Id: Icee15d346c32dff693b5c474a51fb79763841bb7
    Signed-off-by: Markos Chandras <mchandras@suse.de>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 1484876..86c5433 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 14848765ddf548904d552cfb799df5569f7efaf4
+Subproject commit 86c54336f9de52fd82379f75b403de5cbcb35a38